Machine for making carbon-paper.



No 760,124. "PATENTED MAY 17, 1904.

v F. B. HOW. I MACHINE FOR MAKING CARBON PAPER.

APPLICATION FILED SEPT. 26, 1903.-

N0 MODEL.

BY 5: ATTORiEY I UNITED STATES Patented May 17, 1904,

PATENT OFFICE.

FRED BRADFORD HOW, OF l/VINTHROP, MASSACHUSETTS.

MACHINE FOR MAKING CARBON-PAPER.

SPECIFICATION forming part of Letters Patent N0. 760,124, dated May 17, 1904.

Application filed September 26, 1903. Seria1 No.174,8Q3. (N0 model.) i

To all whom, it may concern.-

Be it known that I, FRED BRADFORD How, a citizen of the United States, residing at Winthrop, in the county of Suffolk and Stateof Massachusetts, have invented certain new and useful Improvements in Machines for Making Carbon-Paper; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in machines for applying a coating of transferable material, such as carbon, to one side of a suitable paper, and has for its object to provide a very simple and economical machine for this purpose, A further object of my invention is to apply the coating continuously and uniformly, so that it shall be evenly spread on the paper, while at the same time any surplus coating shall be instantly removed and conveyed back again to the carbon-reservoir.

With these ends in view my invention consists in the details of construction and combination of parts, such as will be hereinafter fully set forth and then specifically designated by the claims.

In the accompanying drawings, which form a part of this application, Figure 1 is a side elevation of my improved machine; Fig. 2, a detail longitudinal sectional elevation of one of the inking-drums, and Fig. 3 a section at the line 1/ fl/ of Fig. 2.

Similar numbers of reference denote like parts in the several figures of the drawings.

1 is any suitable frame, 2 a power-shaft journaled therein, and 3 a large gear-wheel carried by said shaft.

4 represents drnmswhich are fastened to the top of the frame in any suitable manner and which contain the carbon solution and to which I will hereinafter refer as inkingdrums. These drums are all alike, and therefore a description of one of them will be sufficient. Journaled within a chamber 7 extending longitudinally in the drum, is a screw 8, which chamber at one end opens into a reservoir 9 for holding the carbon solution. The screw extends through the reservoir, and outside the latter a spur-gear 10 is secured to the shaft of the screw and meshes with the large gear 3. The reservoir is open at the top, so that the carbon solution may be supplied therein from time to time, and a narrow gate 11 leads from the top of the chamber 7 to the outside of the drum, the outer mouth of which gate is preferably contracted by means of a slitted strip 12, of rubber or other suitable material, disposed within a dovetailed recess in the drum. Within the drum is a steamjacket 13, which almost surrounds the charm ber 7, which jacket has an inlet 14 for the steam. Immediately beyond the mouth of the" gate 11 is a gutter 15, which is inclined toward and leads into the reservoir 9, as shown by dotted line at Fig. 2, and the farther or higher wall of this gutter is formed into a scraper 16. p

The paper to be coated is supported in the usual manner in the form ofa roll 17 on a bracket 18, extending from the frame of the machine, and is passed beneath an idle roll 19 up across the faces of the drums/1, thence down beneath an idleroll 9.0, and then is wound on any suitable roller 21, supported on a bracket 22, extendingfrom the frame of the machine. The object of theseidle rolls isto keep the paper snugly against the outer mouths of the gates 11 and the scrapers 16.

The steam-jackets 13 keep thecarbon solution at the proper consistency, so that it will circulate and feed readily, while the action of the screws 8 delivers the solution from the reservoirs into the chambers 7 until the latter are full, so that the continued action of the screws will force the solution out through the gates 11. This feeding of the carbon solution is regulated by the speed of the gear 3, which speed may be varied in any usual wellknown manner.

The operation of my improvement is as follows: The paper to be coated is disposed across the faces of the drums, as hereinbefore set forth. As the paper is wound on the roller 21 the under surface will be coated with the carbon solution, and any surplus of the latter will be removed by the scrapers and will drop into the gutters 15 and flow back into the reservoirs. If desired, the threads of the screws may be made deeper at the reservoir' end of the drums, so as to extend down near the bottom of the reservoirs; but this is not necessary, since the carbon solution will be kept sufiiciently agitated by the screws, as shown by the drawings, so long as the proper temperature of the solution is maintained.

I have shown only three inking-drums; but it will of course be obvious that more or less of these drums may be employed without departing from the spirit of my invention.

In case the gates 11 or the strips 12 become clogged they can be readily cleared or the strips may be removed and other strips substituted. It willbe seen that the screws serve to both agitate and feed the carbon solution continuously, and therefore there can be no interruption of theagitation during the feeding, and consequently so long as the steamjacket maintains the proper temperature of the carbon solution the latter cannot cake or stick to the bottom or sides of the chambers or reservoirs.

The idle rolls are of course not necessary, since the means for supplying and taking up the paper may be so located that the paper will be properly disposed with respect to the inking-drums, and therefore I do not wish to be limited in this respect.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In amachine for coating paper with carbon solution, the combination of a plurality of inking drums having outlet gates, rotary screws within said drums whereby the carbon solution is agitated and forced through said gates, and means for drawing the paper across said gates, substantially as set forth.

2. In a machine for coating paper with carbon solution, the combination of a plurality of stationary inking-drums having outlet-gates and scrapers, and provided with inclined gutters intermediate of said gates and scrapers, rotary screws within said drums whereby the carbon solution is agitated and forced through said gates, and means for drawing the paper snugly against said drums and across said gates and scrapers, substantially as set forth.

3. In a machine for coating paper with a carbon solution, the combination of a plurality of stationary inking drums having ink reser voirs at one end and interior chambers leading into said reservoirs, and provided with narrow gates leading to the external surfaces of said drums, screws journaled within said chambers and reservoirs, means for revolving said screws and means for drawing the paper across said gates, substantially as set forth.

4L. In a machine of the character described, the combination of a plurality of stationary inking-drums having reservoirs for holding the carbon solution and elongated chambers leading into said reservoirs and provided with narrow gates leading to the external surfaces of said drums the latter also containing steamjackets around said chambers, screws journaled' within said drums and extending throughout said chambers and reservoirs, means for revolving said screws whereby the carbon solution is fed within said chambers and-forced through said gates, and means for properly delivering and feeding the paper snugly against the'drums and across the gates, substantially as set forth.

5. In a machine of the character described, the combination of a plurality of inking-drums having at one end reservoirs for holding the carbon solution, and provided with elongated chambers which lead into said reservoirs and which have narrow gates that lead to the external surfaces of said drums, the latter also formed with steam-jackets around said chambers and also provided with scrapers beyond said gates and inclined gutters intermediate of said gates and scrapers, the screwsjournaled within said drums and extending lengthwise throughout said chambers and reservoirs and carrying spurgears outside said drum, the large gear wheel meshing with said spurgears, a supply-roller from which the paper is delivered, a take-up roller on which thepaper is wound after coating, and idle rolls intermediate of said rollers and superimposed upon the paper on opposite sides of the machine whereby said paper is caused to snugly lie against said gates and scrapers, substantially as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

FRED BRADFORD HOW. Witnesses:

BESSIE L. WEBBER, THOMAS T. HINKLEY. 

